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Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | $ 1,068,032 | $ 977,830
Unrealized Gains | (35,766) | (43,354)
Unrealized Losses | (6,705) | (440)
Securities available-for-sale | 1,097,093 | 1,020,744
US Government Agencies Debt Securities [Member] |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 95,361 | 92,710
Unrealized Gains | (3,676) | (5,105)
Unrealized Losses | (95) | (1)
Securities available-for-sale | 98,942 | 97,814
Mortgage Backed Securities - Residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 447,454 | 346,606
Unrealized Gains | (7,162) | (8,794)
Unrealized Losses | (5,137) | (279)
Securities available-for-sale | 449,479 | 355,121
Mortgage Backed Securities - Commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 15,808 | 17,931
Unrealized Gains | (440) | (559)
Unrealized Losses | 0 | 0
Securities available-for-sale | 16,248 | 18,490
Collateralized Mortgage Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 179,460 | 209,556
Unrealized Gains | (3,975) | (4,761)
Unrealized Losses | (174) | (157)
Securities available-for-sale | 183,261 | 214,160
State and Municipal Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 305,159 | 285,837
Unrealized Gains | (16,976) | (20,294)
Unrealized Losses | (892) | 0
Securities available-for-sale | 321,243 | 306,131
Collateralized Debt Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 0 | 0
Unrealized Gains | (3,328) | (3,136)
Unrealized Losses | 0 | 0
Securities available-for-sale | $ 3,328 | $ 3,136

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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